Dual infrared + intelligent digital analysis. Pet immunity ( small animals weighing up to 11kgs ). Full range automatic temperature compensation, super anti false alarm. Digital signal microprocessor, High density SMT Craft. Long life high stable circuit, fireproof housing, Working Voltage : DC9-16V. Fully shielded technology, anti-RFI, Environmental testing mode. LOADIF stage FRESNEL lens, LED ON/OFF selectable. Digital automatic pulse adjustment, Detecting angle : 360°en